Juan carried the bullet casings in his pocket for the rest of the week. He knew the risks. If a police officer stopped and searched him on the street, under even the flimsiest pretext, he was doomed. Either he would be identified as the witness to a military murder or would stand accused of being a subversive himself. In San Salvador, in 1980, people were killed for much less. On Sunday morning, he set out to deliver the bullets to the one person he thought could help: Óscar Romero, the archbishop of San Salvador.

